That is the case for 3DBDs, always. Although left/right could be swapped and the AVC stream actually be the right eye, but there is always one main AVC stream you can just take without the MVC stream to get 2D.

That is the case for 3DBDs, always. Although left/right could be swapped and the AVC stream actually be the right eye, but there is always one main AVC stream you can just take without the MVC stream to get 2D.

To grab the 2D movie, you have to demux the MPLS, and select the AVC video stream and the audio and subtitle streams you are interested in, and drop the MVC. If you want to demux directly the M2TS file(s), you have to locate the one that contains the AVC stream. It's easy with a good player. The M2TS files with the MVC stream cannot be played directly.

The command to demux is exactly identical to the command to demux a 2D BD, just omit the MVC stream. But personally, I would use tsMuxeR instead of eac3to to demux a BD. It has a good GUI, easy to use.

To grab the 2D movie, you have to demux the MPLS, and select the AVC video stream and the audio and subtitle streams you are interested in, and drop the MVC. If you want to demux directly the M2TS file(s), you have to locate the one that contains the AVC stream. It's easy with a good player. The M2TS files with the MVC stream cannot be played directly.

The command to demux is exactly identical to the command to demux a 2D BD, just omit the MVC stream. But personally, I would use tsMuxeR instead of eac3to to demux a BD. It has a good GUI, easy to use.

Anybody have issues with the audio being completely out of sync on Blu-ray titles that feature both a theatrical and extended cut? It seems as if the audio tracks between the two releases are getting mixed up...

Edit: Okay, so I looked at the log, and it isn't pretty:

[a04] Audio has a gap of 31ms at playtime 0:16:23. <WARNING>
[a04] Audio has a gap of 31ms at playtime 0:19:56. <WARNING>
[a04] Audio has a gap of 31ms at playtime 0:32:59. <WARNING>
[a04] Audio has a gap of 31ms at playtime 0:34:25. <WARNING>
[a04] Audio has a gap of 31ms at playtime 0:54:09. <WARNING>
[a04] Audio has a gap of 31ms at playtime 0:58:47. <WARNING>
[a04] Audio has a gap of 31ms at playtime 1:09:57. <WARNING>
[a04] Audio has a gap of 31ms at playtime 1:11:45. <WARNING>
[a04] Audio has a gap of 31ms at playtime 1:21:48. <WARNING>
[a04] Audio has a gap of 31ms at playtime 1:27:02. <WARNING>
[a04] Audio has a gap of 31ms at playtime 1:42:03. <WARNING>
[a04] Audio has a gap of 31ms at playtime 1:52:59. <WARNING>
[a04] Audio has a gap of 31ms at playtime 2:05:13. <WARNING>
[a04] Audio has a gap of 31ms at playtime 2:06:03. <WARNING>
[a04] Audio has a gap of 31ms at playtime 2:10:04. <WARNING>
[a04] Audio has a gap of 31ms at playtime 2:15:49. <WARNING>
[a04] Audio has a gap of 31ms at playtime 2:23:46. <WARNING>
[a04] Audio has a gap of 31ms at playtime 2:25:37. <WARNING>
[a04] Audio has a gap of 31ms at playtime 2:31:14. <WARNING>
[a04] Audio has a gap of 31ms at playtime 2:34:07. <WARNING>
[a04] Audio has a gap of 31ms at playtime 2:44:08. <WARNING>
[a10] Audio has a gap of 20ms at playtime 0:16:23. <WARNING>
[a10] Audio has a gap of 10ms at playtime 0:19:56. <WARNING>
[a10] Audio has a gap of 10ms at playtime 0:32:59. <WARNING>
[a10] Audio has a gap of 31ms at playtime 0:34:25. <WARNING>
[a10] Audio has a gap of 20ms at playtime 0:54:09. <WARNING>
[a10] Audio has a gap of 20ms at playtime 0:58:47. <WARNING>
[a10] Audio has a gap of 10ms at playtime 1:09:57. <WARNING>
[a10] Audio has a gap of 20ms at playtime 1:11:45. <WARNING>
[a10] Audio has a gap of 31ms at playtime 1:21:48. <WARNING>
[a10] Audio has a gap of 31ms at playtime 1:27:02. <WARNING>
[a10] Audio has a gap of 10ms at playtime 1:42:03. <WARNING>
[a10] Audio has a gap of 10ms at playtime 1:52:59. <WARNING>
[a10] Audio has a gap of 20ms at playtime 2:05:13. <WARNING>
[a10] Audio has a gap of 31ms at playtime 2:06:03. <WARNING>
[a10] Audio has a gap of 31ms at playtime 2:10:04. <WARNING>
[a10] Audio has a gap of 31ms at playtime 2:15:49. <WARNING>
[a10] Audio has a gap of 20ms at playtime 2:23:46. <WARNING>
[a10] Audio has a gap of 31ms at playtime 2:25:37. <WARNING>
[a10] Audio has a gap of 31ms at playtime 2:31:14. <WARNING>
[a10] Audio has a gap of 31ms at playtime 2:34:07. <WARNING>
[a10] Audio has a gap of 10ms at playtime 2:44:08. <WARNING>
[a11] Audio has a gap of 52ms at playtime 0:16:23. <WARNING>
[a11] Audio has a gap of 10ms at playtime 0:19:56. <WARNING>
[a11] Audio has a gap of 42ms at playtime 0:32:59. <WARNING>
[a11] Audio has a gap of 31ms at playtime 0:34:25. <WARNING>
[a11] Audio has a gap of 52ms at playtime 0:54:09. <WARNING>
[a11] Audio has a gap of 20ms at playtime 0:58:47. <WARNING>
[a11] Audio has a gap of 42ms at playtime 1:09:57. <WARNING>
[a11] Audio has a gap of 52ms at playtime 1:11:45. <WARNING>
[a11] Audio has a gap of 31ms at playtime 1:21:48. <WARNING>
[a11] Audio has a gap of 31ms at playtime 1:27:02. <WARNING>
[a11] Audio has a gap of 42ms at playtime 1:42:03. <WARNING>
[a11] Audio has a gap of 42ms at playtime 1:52:59. <WARNING>
[a11] Audio has a gap of 20ms at playtime 2:05:13. <WARNING>
[a11] Audio has a gap of 31ms at playtime 2:06:03. <WARNING>
[a11] Audio has a gap of 31ms at playtime 2:10:04. <WARNING>
[a11] Audio has a gap of 31ms at playtime 2:15:49. <WARNING>
[a11] Audio has a gap of 52ms at playtime 2:23:46. <WARNING>
[a11] Audio has a gap of 31ms at playtime 2:25:37. <WARNING>
[a11] Audio has a gap of 31ms at playtime 2:31:14. <WARNING>
[a11] Audio has a gap of 31ms at playtime 2:34:07. <WARNING>
[a11] Audio has a gap of 42ms at playtime 2:44:08. <WARNING>

Does this mean that the disc/release is bad? I understand that eac3to tries to fix these errors, but apparently it isn't working.

It turns out that the sync issue isn't there when I use MakeMKV instead of Clown_BD and MKVMerge. Apparently, the problem stems from demuxing the playlist file first instead of muxing directly to MKV. I have no idea why that is.

Also I don't know the eac3to version, Clown_BD is a old GUI for eac3to, you need latest eac3to version to manage h265/HEVC BD's.
You can see how manage Clown_BD the video:
[v02] Creating file "G:\00 Mux\Gladiator\Audio_2_Undetermined.h265"...

The BD features both a theatrical and extended cut, but I am only attempting to make an MKV of the extended version. I will try the -no2ndpass parameter, assuming I can figure out how to work eac3to from the command line. (I have only ever used a GUI for eac3to.)

I made a mistake when I said I was working with an .m2ts file earlier; the input is actually an .mpls playlist file. Interestingly, I was able to drag this directly into mkvmerge to create a problem-free file, which would imply that the -no2ndpass parameter should work.

Yes mkvmerge can handle mpls playlist files and audio almost always in synch but your BD has identical frames and that shift the chapter points a little bit (not always but often) without separate demuxing the audios.

Anybody have issues with the audio being completely out of sync on Blu-ray titles that feature both a theatrical and extended cut? It seems as if the audio tracks between the two releases are getting mixed up...

You are having trouble with a UHD disc not a normal blu-ray.
It's been discussed here earlier on that eac3to can't create properly syncd audios from seamlessly branched UHD discs. I think it someone suggested that has to do with the ffmpeg lib it's using, and that using nero7 switch makes it better (but you probably need to have that nero installed).

Hi,
I encoded a 24 bit wav into ac3 256 kbps with eac3to and discovered that a short silence (27 ms) was added at the end
That's problematic because I have to append another sample after and I hear a gap.
I see the short silence in an audio editor (after converting back to wav).
Is there a solution with eac3to or should I use another encoder ?
Thanks.